Wow, this got kicked up a few notches just now.
Nonetheless, I consider "American currency" virtually meaningless.
Personally, I'll spend my time analyzing things such as how DBC was familiar with Yuma? Why he didn't bring his own parachute? What his plan was if he had to abort the hijacking in Seattle? And, why he wanted the airstairs open immediately after departing, once again, Seattle?
But, that's just me.
There is nothing to waste time on.. US/American currency is significant, implying a foreign influence, that is it. The end.
Apparently, in your 52 years in America those terms are widely used... very very odd. Did you work in a currency exchange?
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As a matter of fact, I was in the currency, futures, puts, calls, etc. business. Beyond that, I'm certain
all Americans have heard the term "American currency" too many times to recall in life. The context is where a distinction can be drawn.
My point is as follows: It would be somewhat unusual for any person, of any nationality, to use any such term when dealing with a "native" transaction. For example, in Canada you wouldn't normally request "Canadian currency" in the normal course of business. Therefore, to claim that DBC's use of the "American currency" phrase implies that he was an American who had spent time out of the country and that most Americans would never say such a thing is a leap.
Again, on what basis do you make this claim? From what I can tell you base it upon your "experience, reason and logic." Okay.
Simply put, I'm asserting that
any American could have used this phrase even if they had never traveled outside of the Pacific Northwest. Period.